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As in other teratomas, cervical teratomas are composed of tissues foreign to their normal anatomic sites. All three germ layers are represented within the tumor. Neural tissue is the most common histologic component, with cartilage and respiratory epithelium also observed (Schoenfeld et al., 1982). Thyroid tissue occurs in 30% to 40% but it is uncertain whether this represents actual involvement of the gland or ectopic thyroid tissue (Jordan and Gauderer, 1988). Theories regarding the origin of cervical teratoma include derivation from totipotential germ cells or abnormal development following cleavage of monozygous twins with fetus in feta (Ashley, 1973; Hitchcock et al., 1987).